`1.` The present has just been opened by Tom

`-` Bị động HTHT: S + has/have + been + V3/ed + (by+O)

`2.` Ha Noi city is smaller than Ho Chi Minh city

`-` Struc:

S1 + tobe + not + so + adj - ngắn + as + S2
`=` S2 + tobe + adj_er + than + S1

`3.` The ruler is longer than this ruler

`4.` The red car us faster than the blue car

`1` The present has just been opened by Tom.

`->` Bị động thì HTHT : S + have / has + been + Ved/V`3` 

`2` Ha Noi City is bigget than Ho Chi Minh City.

`-` So sánh hơn với tính từ ngắn : S + be + adj - er + than + O

`3` The ruler is longer than this one. 

`-` So sánh hơn với tính từ ngắn : S + be + adj - er + than + O

`4` The red car is faster tan the blue one. 

`-` So sánh hơn với tính từ ngắn : S + be + adj - er + than + O

`color{lightblue}{~Qcil~}`